85% (1992)

80% (1993)

79% (1995)

83% (1994)

62% (1990)

82% (1992)

71% (1993)

64% (1996)

70% (1991)

68% (1992)

78% (1990)

53% (1993)

69% (1990)

68% (1996)

75% (1999)

68% (1994)

79% (1998)

72% (1994)

72% (1998)

74% (1991)